问答题If 10a + 10b =35, what is the average (arithmetic mean) of a and b?

题目

问答题

If 10a + 10b =35, what is the average (arithmetic mean) of a and b?

相似考题

1.In a weather report GMT stands for ________ ．A.Greenwich Mean TimeB.Local Mean TimeC.General CargoD.General Average

2.The average height of the surface of the sea for all stages of the tide over a 19 year period is called ______.A.mean high waterB.mean low waterC.half-tide levelD.mean sea level

3.问答题Kara attends a university where students study for an average (arithmetic mean) of 13.4 hours per week. How many hours per week does Kara study?　　(1) The standard deviation of study time at Kara’s school is 2.8.　　(2) Kara’s study time is one standard deviation away from the mean.

4.The height of a light is measured from which reference plane?A.Mean low waterB.Mean high waterC.Average water levelD.Geographical sea level

更多“问答题If 10a + 10b =35, what is the average (arithmetic mean) of a and b?”相关问题

第1题：

问答题
what is mean of ospf auto-cost reference-bandwidth？

正确答案： The OSPF metric is calculated as the ref-bw value divided by the bandwidth value.The default ref-bw is 10^8bps.Cisco provides the command auto-cost reference-bandwidth， which allows the default reference bandwidth to be changed.
解析：暂无解析
第2题：

单选题
The average (arithmetic mean) of c and d is 12, and the average of c, d, and e is 10. What is the value of e?
A
6
B
10
C
12
D
18
E
20

正确答案： A
解析：
根据题目中已知的数量关系，可列等式如下：c+d= 12×2=24……①；c+d+e=10×3=30……②。把等式①代入等式②得，24+e=30，e=6。
第3题：

问答题
An aircraft flew from A to B at an average speed of 230 mph. It returned from B to A at an average speed of 300 mph. What was its average speed for the two journeys?

正确答案： 260 mpf
解析：
设飞机从A到B耗时a小时，从B到A耗时b小时，那么可得出230a=300b；飞机飞行整个路程中所用的平均速度则为300b/(a+b)；将两个方程式合并，便可得出平均速度约为260.3 mpf，四舍五入后取结果260mpf。
第4题：

问答题
At the beer-drinking contest the winner drank an average of 10 bottles of beer at the first 20 rounds. After a further 20 rounds the average increased to 15 bottles. What is the average for the last 20 rounds?

正确答案： 20.
解析：
在前20轮中胜者平均喝10瓶酒，共喝200瓶。再过20轮后平均喝15瓶，即共喝了40×15=600瓶。故，后20轮喝了400瓶，胜者平均喝20瓶。
第5题：

单选题
If 70% of the bananas in a particular harvest had an average (arithmetic mean) length of 7 inches and 30% of the bananas in that harvest had an average (arithmetic mean) length of 5 inches, what was the average (arithmetic mean) length, in inches, of all of the bananas in the harvest?
A
6.0
B
6.2
C
6.4
D
6.6
E
6.8

正确答案： B
解析：
假设共有100个香蕉，根据题干全部香蕉的长度为(100×70%×7)+(100×30%×5)=640英尺，共有100只香蕉，所以平均每只香蕉的长度为640/100=6.4。故选C。
第6题：

问答题
what does DHCP binding mean？

正确答案： DHCP binding is a mapping between the client’s IP address and client’s hardware addresses on DHCP server.
解析：暂无解析
第7题：

问答题
If M is a set of five numbers p, q, r, s and t, is the range of numbers in M greater than 5?　　(1) The average (arithmetic mean) of p, q, r, S, and t is 5.　　(2) p-r>5.

正确答案： B
解析：
条件1不能判断M数集的极差；由p-r>5可知p、r间的距离大于5，故M的极差大于5，所以本题应选B项。
第8题：

单选题
The average (arithmetic mean) of a set of seven numbers is 81. If one of the numbers is discarded, the average of the remaining numbers is 78. What is the value of the number that was discarded?
A
98
B
99
C
100
D
101
E
102

正确答案： B
解析：
If the average (arithmetic mean) of a set of seven numbers is 81, then the sum of these seven numbers is 7 x 81 or 567. Since, if one of the numbers is discarded, the average of the six remaining numbers is 78, the sum of these six numbers is 6×78 or 468. Since 567 - 468 = 99, the value of the number that was discarded is 99.
第9题：

问答题
What does the ‘unwanted’ deep sea life mean in Paragraph 2 according to the passage?

正确答案： They have no economic value.
解析：
词义理解题。像乌贼、海胆、海星等一些海洋生物由于没有经济价值因此它们不是渔民捕捞的对象，是渔民不需要的东西，所以正确答案是“They have no economic value”。
第10题：

单选题
If the average (arithmetic mean) of 3, 7, 10, and x is 7, then what is the median of 3,7,10, and x?
A
5.5
B
6
C
6.5
D
7
E
7.5

正确答案： D
解析：
因为3,7,10,和x 的平均数是7，可得出等式(3+7+10+x)/4=7，(20 + x)/4= 7，20+ x = 28，x = 8。所以3,7,10,和x四个数排序为3,7,8,10，它们的中位数为(7+8)/2=7.5。
第11题：

单选题
If the average (arithmetic mean) of a, b, 4, and 10 is 8, what is the value of a + b?
A
4
B
6
C
9
D
15
E
18

正确答案： B
解析：
根据题干可得出(a+ b + 10 + 4)/4=8，a + b=18。
第12题：

问答题
MegaTech and UltraCorp are considering a merger to form the MegaUltraTech Corporation. Does MegaTech have more employees than UltraCorp?　　(1) The average (arithmetic mean) age of UltraCorp employees is 32.8, while the average age of MegaTech employees is 27.2.　　(2) If the merger goes through and all employees from both companies remain employed, the average (arithmetic mean) age of the MegaUltraTech employees will be 31.4.

正确答案： C
解析：
条件1、2中均不涉及两个公司的员工数量，但是将两者综合可以推断出UltraCorp的员工数大于MegaTech，故本题选C项。
第13题：

问答题
what does BGP neighbor in active state mean？

正确答案： In this state， the BGP process is trying to initiate a TCP connection with the neighbor.
BGP TCP connection unsuccessfull in connect state will cause neighbor state transfer to active state.
解析：暂无解析
第14题：

单选题
What is the average (arithmetic mean) of 8 consecutive odd integers if the smallest of those integers is n?
A
n+5
B
n+6
C
n+7
D
n+8
E
n+9

正确答案： D
解析：
最小的整数为n。它们是连续的奇数。这组整数为:n,n+ 2, n+4, n+6, n+8, n+10, n+12, n+14。计算这些整数的平均数即为将它们想加除于8。得出（8n+56）/8=n+7
第15题：

问答题
What does the term “usher in” (Line 5, Para.4) mean?

正确答案： Introduce.
解析：
词义理解题。usher in所在句子为：“这样的发展很可能会……无成瘾性药物使用的新时代。”结合上下文可以推测出，usher in在这里是“引领，引进，进入”的意思，所以可以使用单词introduce。
第16题：

问答题
At the eating contest the winner ate an average of 15 hot dogs at the first 20 sittings. After a further 20 sittings the average increased to 20 hot dogs. What was the average for the last 20 sittings?

正确答案： 25.
解析：
前20轮共吃汉堡300个，40轮下来共吃汉堡800个，则后20轮吃汉堡500个，因此每轮吃25个。
第17题：

单选题
If the set S is composed of the following numbers {99, 100, 100, 105, 106, 116, 123}, which of the following is largest?
A
The average (arithmetic mean) of set S
B
The median of set S
C
The mode of set S
D
The range of set S
E
The standard deviation of set S

正确答案： B
解析：
根据公式可知，A项S数集的平均数=107，B项S数集的中位数=105，C项S数集的众数=100，D项S数集的极差=24，E项S数集的标准差≈9，故本题选A项。
第18题：

问答题
If a is an integer, is b an integer?　　(1) The average (arithmetic mean) of a and b is an integer.　　(2) The average (arithmetic mean) of a, b, and b+4 is a.

正确答案： D
解析：
根据算数平均数的定义可知，本题应选D项。
第19题：

单选题
The average (arithmetic mean) of five numbers is 10. The sum of three of the numbers is 30. What is the sum of the other two numbers?
A
5
B
10
C
20
D
30
E
40

正确答案： C
解析：
The arithmetic mean of the five numbers is 10. That means the sum of the numbers is 50. The sum of three numbers is 30. so the sum of the remaining two numbers is 50-30 = 20.
第20题：

问答题
What does the word “piquant” in the last paragraph probably mean?

正确答案： Interesting.
解析：
语义理解题。文章首段提到，在Virginius看来，妻子除了缺少一点令人心动的脆弱之外可以说是堪称完美。之后又表示这样的完美减少了很多乐趣，尤其是爱情的乐趣。文章尾段与首段相互呼应，提到即便是最不挑剔的丈夫也希望妻子具有一些piquant的品质，而不仅仅是善良。由此可以推断，piquant应该是一种让人觉得有趣的品质，而Victoria所缺少的正是这种品质。
第21题：

单选题
For integer values of the age from 10 months to 14 months, the average (arithmetic mean) weight falls approximately between ______ pounds.
A
750 and 850
B
850 and 950
C
950 and 1050

正确答案： C
解析：
在10个月时，大象的体重大约为800磅，到了14个月大象的体重大约为1000磅，在这期间大象的体重变化比较平稳，因此体重平均数大约为900磅，故答案选B。
第22题：

单选题
The average (arithmetic mean) of x and y is m, where m ≠ 0. What is the average (arithmetic mean) of x, y, and 2m?
A
m
B
4/3m
C
3/2m
D
5/3m
E
2m

正确答案： D
解析：
因为x和y的算术平均数为m，所以x+y=2m，所以，所以x,y,2m的算术平均数为x+y+2m/3，因为x + y = 2m，所以x+y+2m/3=4m/3
第23题：

问答题
What is the average (arithmetic mean) of x and y?　　(1) The average of x+3 and y+5 is 14.　　(2) The average of x,y and 16 is 12.

正确答案： D
解析：
将两条件分别代入计算可知，x和y的平均数均为10，故本题选D项。

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问答题If 10a + 10b =35, what is the average (arithmetic mean) of a and b?

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